The plate OAB forms an equilateral triangle which rotates counterclockwise with increasi...

The plate OAB forms an equilateral triangle which rotates counterclockwise with increasing speed about point O. If the normal and tangential components of acceleration of the centroid C at a certain instant are 80 m/s² and 30 m/s², respectively, determine the values of and at this same instant. The angle is the angle between line AB and the fixed horizontal axis.